Revonox^® 501: An Eco-Friendly High-Performance Polymer Antioxidant
As industries worldwide shift towards sustainability, the demand for eco-friendly and high-performance materials is growing rapidly. Revonox^® 501 emerges as a breakthrough antioxidant solution, designed specifically to enhance the stability and durability of polymers such as PP, PE, and PBT, with a strong focus on engineering plastics. Combining the functions of a carbon-centered radical scavenger and a primary antioxidant, Revonox^® 501 offers comprehensive protection, helping materials last longer while minimizing environmental impact.

Why Choose Revonox^® 501?

1. Dual Antioxidant Protection:

Revonox^® 501 offers a unique dual protection mechanism, surpassing typical commercial antioxidants by not only acting as a primary antioxidant but also effectively scavenging carbon-centered radicals:

• Carbon-Centered Radical Scavenger: Revonox^® 501 targets the primary degradation factors in polymers—carbon-centered radicals—and effectively suppresses chain reactions triggered by these radicals, thereby protecting the structural stability of the material and significantly extending its lifespan.
• Primary Antioxidant Function: It prevents oxidation reactions by capturing free radicals.

2. High Temperature Stability: 

Revonox^® 501 is specially designed to withstand high-temperature environments, remaining stable at temperatures up to 300°C. According to thermogravimetric analysis (TGA) data, Revonox^® 501 shows negligible weight loss below 300°C, making it ideal for high-temperature processing applications and suitable for engineering and recycled plastics.

Environmental and Sustainability Benefits:

• Reducing Plastic Waste and Extending Product Lifespan: The exceptional thermal stability and melt flow index (MFI) control of Revonox^® 501 significantly extend the lifespan of polymers, reducing dependence on new materials. This not only lowers the need for frequent material replacement but also effectively reduces plastic waste generation.
• Promoting a Circular Economy: Revonox^® 501 ensures that recycled plastics maintain excellent performance and appearance even after multiple processing cycles, supporting sustainable manufacturing practices.
• High Efficiency, Low Dosage: With just 50-100 ppm, Revonox^® 501 demonstrates robust stabilization effects, significantly reducing chemical usage and enabling high-performance and eco-friendly production practices that meet modern corporate sustainability needs.
• Color Protection: During high-temperature processing, Revonox^® 501 helps maintain material color stability, reducing the need for additional chemical treatments and enabling more environmentally friendly and efficient production processes.

Extending Oxidation Induction Time (OIT):

Oxidation induction time is a critical indicator of a polymer's antioxidation performance. Without antioxidant protection, PP (polypropylene) has poor resistance to oxidation and quickly enters the oxidation reaction stage.

• High Oxidation Risk for PP: Without antioxidant protection, pure PP faces severe oxidation risk, especially in high-temperature environments, leading to material failure, limited application range, and shortened product lifespan.
• Extending Oxidation Induction Time: With the addition of an effective antioxidant, the oxidation induction time of PP is significantly extended, enhancing the material's stability and durability. Revonox® 501 provides better protection, reducing the need for maintenance and replacement.

Revonox^® 501: A Comprehensive Solution for Enhancing Polymer Processing Performance

When lactone chemistry developed in 90s, it was approved effectively enhancing standard antioxidant package (such as B blends) allowing polyolefins producers pushing processing conditions to more severe level than before. Followed by the well-known product Irganox^® HP-136 off shelf from market, Chitec introduced Revonox^® 501 with own IP to industries based on the same lactone chemistry but higher molecular weight, so as to reduce toxicity concerns.

As the demand for improved polymer processing continues to grow, stability and durability have become key factors in product competitiveness. Revonox^® 501 is a multifunctional antioxidant specifically designed for high-performance polymer applications, reducing processing losses and extending product life. Whether in polyurethane foam, polyurethane fibers, or multi-extrusion polypropylene, Revonox^® 501 provides effective protection.

1. Anti-Scorching of PU Foam

Scorching is unavoidable during foam expansion, when volume expanded faster than heat dissipated from center. Antioxidants are used to resolve PU foam scorching, or “red-heart” phenomenon when chloro allyl phosphate ester (a common FR(flame retardant) used in foam) in the system.

It’s proved that Revonox^® 501 applied in PU foam system effectively removing carbon center radicals, even more valuable to automotive industries when tighter VOC standard implemented to car interior and foam structures are one of the most contributors to volatiles.

Test Results: Compared to other antioxidants, samples containing Revonox® 501 showed almost no signs of scorching.

• Blank Sample: Samples without antioxidants exhibited extensive scorching, indicating severe thermal oxidative damage.
• Other Antioxidants: Samples with other antioxidants showed reduced scorching but still had visible yellow spots, indicating limited effectiveness.
• Revonox^® U-5035 (Revonox^® 501 Blend Formulation): Samples with Revonox^® 501 showed almost no scorching, demonstrating exceptional anti-scorching performance and significantly improving the thermal stability of the material.

These results prove that Revonox^® 501 effectively prevents yellowing and scorching during the high-temperature processing of polyurethane foam, reducing the occurrence of defective products, improving production efficiency, and achieving higher economic benefits.

2. Color Retention of Polyurethane Fiber (PU Fiber, Spandex)

Polyurethane fibers often experience yellowing due to thermal oxidation during high-temperature processing, significantly affecting the appearance of the product. Revonox^® 501 effectively inhibits yellowing at high temperatures, providing excellent color retention and maintaining product appearance and quality.

Test Conditions: This test involved different treatments of PU fibers, heated at 300°C for 4 minutes to simulate yellowing during processing.

Test Results: In the test, samples A and B with Revonox^® 501 reduced the yellow index (YI) to 14.7 and 10.9, respectively, at 300°C. In contrast, the blank sample without antioxidants showed a YI of 30.1, indicating severe yellowing. Revonox^® 501 provides outstanding color retention for the high-temperature processing of polyurethane fibers, significantly reducing yellowing and making it particularly suitable for products with high appearance requirements.

3. MFI Control in Multi-Extrusion Polypropylene (PP)

During the multi-extrusion processing of polypropylene, the melt flow index (MFI) increases rapidly with each extrusion cycle, leading to a decline in material performance. Revonox^® 501 significantly improves MFI control during multi-extrusion, maintaining material stability.

Test Results: In the multi-extrusion test, samples with Revonox^® 501 demonstrated excellent MFI control. After five extrusions, the MFI of the blank sample increased sharply. Although the sample with a comparative antioxidant system showed some improvement, it still could not effectively control the MFI. The mixed system with Revonox^® 501, however, showed only minor changes in MFI, demonstrating remarkable stability.

📨For more product information, please contact our sales team at sales@chitec.com

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